Oil-pump.



A. STRAND.

OIL PUMP. APPLICATlON FILED JUNE 4.1915.

l ,27%48@ Patented Sept. 17, 1918.

2 SHEETS-SHEET l.

`A. STRAND.v

olL PUMP. APPLICATION FILED )UNE 4.1915.

,279,480 Patented Sept. 17, 1918..

2 SHEETS-SHEET 2.

ANDREW STRAND, or MINNEAPoLis, lviiNNnso'rAf OILPUNLP. i

Application filed June 4, 1915`.` 'S'rial :No1 32,226.

State of Minnesota, have invented a vnew and useful lmprovement in Oil-Pumps, of which the following is a specication.

My invention relates to oil pumps of the rotary cylindrical type, which is compact and isadapted to be easily adjusted at will to feed a desired amount of oil. There are no ball or check valves to get out'- of order and oil cannot flow through-the pump when the pump is not operating-for when the supply vent is open-the outlet is closed and vice versa; Y Y v A further object of my invention is to provide a-sight in the casingcovering the oil pump which exposes the outlet vent of the pump to the operator so tha-t the amount of oil being fed by the pump can be easily determined at a glance. The pump has only two moving parts, a sleeve and a plunger within the sleeve.

In: the accompanying drawings forming part of this specification similarlletters refer to similar` parts throughout the several views, inwhich: Y

Figure 1 is a'detail partly in section of a gas engine cylinder and crank' case illustrating: my pump in the discharging position;

Fig. 2 is a detail of my pump illustrated in' the intaking position; Y

Fig. 3 illustrates a portion ofthe pump and worm gear on thecam shaft which rotates the pump; l f y Fig. 4 illustrates a longitudinal view of the sleeve and plunger` therein; Y

Fig. 5 is anend View of Fig. l;

Fig. 6 is a view of theplunger-removed from the sleeve; d

F ig, 7 is a view of the casing in which the sleeve rotates; y

Figs. 8 and 9 are views of the camwhich operates the plunger;

Figs. 10 and 11 are .views of the collar which holds the pump vand parts in position in the crank case;

Figs. 12 and 13 are sectional views on the line X-X of Fig. 2.

In the drawings, A indicates a gas engine cylinder a portion of which is broken away,

Specification of Letters`]'E"atcntiv thecylinder, being secured to :the crank-'cased B in' theusual manner, only av portion of the. crank case being shown..V

1 andv 2 througha series' of gears, 3, 4', 5,r and 6, which are. exposedV by the breaking away ofwthe 'coverl plate 7 1 In the upper portion of the crank Ycase and horizontallydisposed isthe oilfpump D,

which is rotated by the worm gear 8 formed on the shaft` 2 andl which meshes with the gear 9'fo'rmed onl the sleeve 10.` Centrally and axially' disposed in the sleeve 10 is a' plunger 11V havingal head 12'w'hich is free to'slide longitudinallyV inthe slots 13 inthe end of the sleeve 10,11and" tlius, when the sleeve 10 is rotated' the/plunger 11v rotates with it. The head 12 has a projectionv13-l which is held againstithe cam 11k-:by a coil spring 15, engagingvthe opposite end of. the

plunger 11. VThe sleeve lOvrotat'es within a.

sleeve housing or bearing 16 which is driven tightly intothe casing B and held in place by the cam ltandnut 17.` LThelsleeve'hous ing 16 has an elongated inlet vent- 18 on the upper side and an elongated outlet vent 19 on` the lower side which. coincide with an elongated vent 20 in the sleeve 10v during the rotation of the sleeve' 10. The vent V20 in the sleevejIO opens into the plunger` chamber 21 in the sleeve 10 and is so constructed that 'a quarter turn ofthe sleeve 10 will open or close the ventf20 withthe openings 18 and 19.V Thus, as is illustrated-k in Fig. 12 the vent 20 is completely opened toinlet vent 18 and, in Fig. 13 the vent 2O is closed but in readiness to openinto com# munication with the outlet vent 19'.

The inlet vent 18 is fedby the supply pipe 22and the outlet vent 19 `opens into the outlet;or dischargingy passage 23 yleading into the plunger and thus regulate the amount of oil fed through the pump D during the rotation and reciprocation of the same.

In operation the shaft 2 rotates the gear 8 which rotates the sleeve 1() together With f 18, the vent 20 begins to open With the disf charge vent 19 and the plunger 11 which is then onits return stroke drives the oil from the chamber 21 into the crank case through the passages 19 and 23. The plunger 11 being reciprocated longitudinally by the cam 14. I-t being obvious that as the oil flows into the top of the pump and leaves at the bottom, the pump is assisted by gravity and as it only takes a quarter of a revolution of the sleeve and plunger to open or close the inlet and outlet vents, oil can not be compressed in the pump or flow through it unless it is being operated, there being but two moving parts in the pump, the sleeve and plunger.

While I have described and illustrated my invention with one particular cylindrical pump, I Wish it understood I do not confine myself to this particular arrangement of parts as described as it is evident my invention may be applied in various manners Within the scope of the following claims.

IVhat I claim is 2 1. In a pump, a cylindrical stationary bearing sleeve, a cylindrical rotatable sleeve, axially positioned in said bearing sleeve, a plunger axially positioned Within said rotatable sleeve and means for rotating` said rotatable sleeve and sin'iultaneously reciprocating said plunger longitudinally in said rota-'f table sleeve for the purposes specified.

2. rI`he combination in a rotary cylindrical pump, of a rotatable sleeve, a plunger axially located in said sleeve, means for rotating said sleeve and plunger together in the same direction and means for reciprocating said plunger' longitudinally in said rotatable sleeve simultaneous `with the rotation of said rotatable sleeve and plunger.

3. A rotary cylindrical pump, a rotatable sleeve, a longitudinally reciprocable plunger axially positioned Within said sleeve, a circular cam for engaging said plunger, re-

Copies of this patent may be obtained for means for engaging said plunger to cause it4 to rotate with said rotatable sleeve, cam engaging means formed on said plunger, a @am ior engaging said cam engaging means to reciprocate said plunger longitudinally inV said rotatable sleeve during the rotation of the same, resilient means for engaging said;

plunger to hold it into engagement With said cam and means for axially engaging the head ol2 said plunger to adjustably limit the longitudinal movement of said plunger' for the purposes specified.

5. An eil pump, comprising, a cylindrical bearing sleeve fixed in the crank case of an engine, inlet and outlet vents formed in said bearing sleeve, a rotatable sleeve adapted to rotate in said stationary sleeve to automatically open and close said inlet and outlet vents, during the operation of said pump, and transparent means in said crank case for exposing the flow of oil from the outlet of said pump for the purposes specied.

6. In an oil pump, the combination with a Cylindrical rotatable sleeve having a longitudinal axially positioned chamber, a plunger longitudinally reciprocable in said chamber,

a vent in said sleeve communicating With said chamber, a sleeve bearing in which said rotatable sleeve is adapted to rotate, outlet vents formed in said sleeve adapted to coincide with said vent in said rotatable 'sleeve sleeve chamber simultaneously With the rotation of said rotatable sleeve and plunger.

ANDREW STRAND. Witnesses D. A. KNDALL, H. L. FISCHER.

five cents each, by addressing the Commissioner of Patenta.'

Washington, D. C. 

